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Provides the evaluator for Telemetry Language expressions, which given a definition, a 
Project, and a time interval, returns one of TelemetryReportObject, TelemetryChartObject,
or TelemetryStreamsObject. 
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The evaluator walks the telemetry expression abstract syntax tree 
and resolves reducer calls and function calls. It evaluates telemetry definitions
and represents the results as TelemetryChartObjects, TelemetryReportObjects, or 
TelemetryStreamsObjects.
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